<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <div id="app">
        <router-link to="/home">主页</router-link>
        <router-link to="/product/123">产品详情1</router-link>
        <router-link to="/product/456">产品详情2</router-link>
        <router-view></router-view>
    </div>
</body>
<script src="../../node_modules/vue/dist/vue.js"></script>
<script src="../.././my-project/node_modules/vue-router/dist/vue-router.js"></script>
<script>
    let routes = [{
        path: "/home",
        beforeEnter: (to, from, next) => {
            console.log("/home 路由的导航守卫");
            next();
        },
        component: () =>
            Promise.resolve({
                template: `<h1>主页</h1>`,
                // 路由进入之前
                beforeRouteEnter(to, from, next) {
                    console.log("组件导航守卫 进入到主页的路由");
                    //   console.log(this); // => undefined 现在还不可以访问到 实例
                    next();
                },
                // 路由更新的时候
                // product/123 => product/456
                beforeRouteUpdate(to, from, next) {
                    console.log("组件导航守卫  主页 路由更新的时候");
                    //   console.log(this); // => 产品详情组件
                    next();
                },
                // 路由离开的时候
                beforeRouteLeave(to, from, next) {
                    console.log("组件导航守卫  离开 /home 路由");
                    //   console.log("现在的路由", from);
                    //   console.log("前往的路由", to);
                    //   console.log(this);
                    next();
                },
            }),
    }, {
        path: "/product/:productId",
        beforeEnter: (to, from, next) => {
            console.log("/product 路由的导航守卫");
            next();
        },
        component: () =>
            import ("./Product.js"),
    }, ];
    let router = new VueRouter({
        routes,
    });
    /* 1. 全局前置导航守卫 */
    router.beforeEach((to, from, next) => {
        console.log("执行 全局的 前置的导航守卫");
        next();
        // to and from are both route objects. must call `next`.
    });
    let vm = new Vue({
        router,
        el: "#app",
    });
</script>

</html>